To be completely honest I never saw any of my dogs do this - that is until Ripley! :D He has done it two or three times in the month that we have had him and it is usually after he has gotten himself wound up from throwing his toys up in the air and playing. When I first saw him do it I thought something was wrong with him. hehe! :D :D So glad to know he is normal and a little embarrassed to say I thought it was something to be concerned about. :rolleyes: